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Mozilla withdraws Firefox add-on malware claim

Firm admits to false positive about Sothink Video Downloader

Mozilla has apologised for wrongly stating that an add-on contained a Trojan

Mozilla has admitted that a
warning
issued by the company last week about security issues with two third-party
add-ons for Firefox was overstated.

The firm had said that two experimental add-ons for the browser contained
malware, but has now withdrawn this claim about one of the add-ons.

Mozilla explained that it had reconsidered its earlier claim that version 4.0
of Sothink Video Downloader contained malware after working with security firm
McAfee to "better understand the threat".

"The suspected Trojan was a false positive, and the extension does not
include malware. Our estimate of 6,000 affected downloads has been revised to
under 700," said Mozilla in a
blog
post.

"The Sothink Video Downloader has been re-enabled on Mozilla Add-Ons. We
apologise to our users and the developers of Sothink for any inconvenience this
has caused."

The other add-on about which Mozilla had warned, the Master Filer extension,
did include a Trojan, however.

Graham Cluley, senior technology consultant at Sophos, said that the
reputation of the developers of Sothink Video Downloader could have been harmed
by an incorrect claim of malware infection.

"I don't think Mozilla was wrong to withdraw the add-on from availability
while its status was under question, but I do think they should have
double-checked before publicly labelling it 'malware'," he wrote in a
blog
post.